Here's a rundown of what I could list for the Bush Family as a political dynasty.
Prescott Bush - 2 term US Senator from Connecticut
George H.W. Bush - Congressman from Texas, Ambassador to the UN, special envoy to China, Director of the CIA, Vice President, President
George W. Bush - 2 term Governor of Texas, President
Jeb Bush - 2 term Governor of Florida, the smarter but sadly younger brother (primogeniture applies in politics)
There is a huge difference in the Bush family dynasty compared to the Kennedy family dynasty. The Bush family is more of an executive branch dynasty, whereas the Kennedy dynasty is more of a legislative branch. More 'power' in the Bush dynasty, but the Kennedy influence maybe greater because of Teddy's long Senate career. The Kennedy's also have a problem with the next generation. Some of Bobby's kids have run for office and lost, while others just are content to be rich assholes that like to ski and play football at the same time while drunk, causing them to crash into trees. Ahhh, the life of a wealthy jerk. The Bush family also has 2 young guns that I could see making political moves: Barbara Bush (the cute, Yale graduate) and George P. Bush. George P. Bush will be a Hispanic military veteran within a decade. Combine some brains (JD from UT) and family money-connections, and you have a winner. It really is as easy as that.